"The verdict is clear proof of the separation of powers in the USA still going strong," BDI board member Wolfgang Niedermark said in a statement.
The United States' highest court ruled that so-called reciprocal tariffs imposed by Trump last year under the International Emergency Economic Powers Act were illegal, potentially blocking a key tool Trump has wielded to drive his economic agenda.
Export-dependent Germany has lost out under the US duties, as goods from cars to chemicals to industrial equipment became less competitive in American markets.
German exports to the United States fell almost 10 percent last year.
Niedermark called for more to be done to lift "unnecessary economic burdens on both sides of the Atlantic", pointing out "remaining uncertainty will continue to burden internationally active companies".
He warned that "the US administration is expected to explore and use alternative means to maintain existing tariffs or introduce comparable protective measures".
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